KR100308181B1 - Underwater Propulsion - Google Patents

Abstract

The underwater propulsion device 1 of the present invention comprises: a cylindrical shield plate 3 having a water inlet 5 and a water outlet 7; A propeller (13) having a hub (15) rotatably mounted to a shaft (9) in the protective plate (3); An electric motor (24) for driving the propeller (13), comprising a rotor (23) mounted around the outer circumference of the propeller (13), and a stator (25) external to the protective plate (3). Wow; A bearing assembly 17 having means 83 and 99 for lubricating and cooling the bearing assembly 17 by circulating water around the bearing surface. The stationary cover 85 is detachably secured to the water inlet end of the shaft 9 above the bearing assembly 17, to provide easy access to the bearings in the bearing assembly 17. The vane member 11 mounted concentrically to the shaft 9 inside the protection plate 3 is connected to the downstream side of the propeller 13 to reduce cavitation when the propeller 13 rotates. It also reduces noise. The magnetization of the rotor 23 is provided by a plurality of permanent magnets 125, improving efficiency and reducing noise. The squirrel barrel structure formed from the damper rod 130 and the conductive wedge 128 is integrated with the magnet of the rotor, which not only assists the starting operation of the motor, but also insulates the magnet from harmonic currents that may reduce their magnetism.

Description

Underwater propulsion

1 is a perspective view of the propulsion device of the present invention.

2 is a sectional view taken along the line II-II of the propulsion device shown in FIG.

3 and 4 are front and rear views of the propulsion device shown in FIG. 1, respectively.

5 (a) is an exploded cross-sectional view of the propulsion device shown in FIG. 1, showing various parts of the bearing assembly disposed between the shaft of the propulsion device and the hub of the propeller;

FIG. 5 (b) is an enlarged view of the portion indicated by the circle 5B in FIG. 5 (a), whereby a toothed surface of the rotor inlet ring and the stator inlet ring forms a twisted path between the stator and the rotor, The figure which shows the method of preventing an external particle from entering into this space.

6 is a sectional view taken along the line VI-VI of the propulsion device shown in FIG.

FIG. 7 is an enlarged view of the portion indicated by the circle 7 in FIG. 6, showing in detail the structure of both the stator and the rotor.

8 is a perspective view of another embodiment of the propulsion device of the present invention having a fixed removable front cover, instead of a front cover that rotates with the hub of the propeller.

9 is a sectional view taken along line IX-IX of the propulsion device shown in FIG.

* Explanation of symbols for main parts of the drawings

1 propulsion device 3 protection plate

9: fixed shaft 13: propeller means

15 hub 17 bearing assembly

23: rotor 24: electric motor

125: permanent magnet 128: wedge

130: damper bar

FIELD OF THE INVENTION The present invention relates to a submersible propulsor unit, and more particularly to an improved marine propulsion device having an integrated motor, high thrust, low weight, low noise and easy to manage.

Integrated motorized propulsion devices have been known in the art. While such propulsion devices can be used on aquatic vessels, their main application is subsidiary drives for submarines, where the need for reliability, control and low noise is rapidly increasing. In the prior art, such propulsion devices typically include "canned" or wet-wound electric motors with output shafts connected to propellers. The propeller is typically circumscribed with a shroud to increase thrust, and the motor is placed directly behind or in front of the propeller. Unfortunately, "canned" motors are placed just before or just after the water flow generated by the propeller, which tends to disrupt the flow of fluid and reduce the effective thrust generated by the device. High speed and small diameter motors have been used to reduce the thrust loss caused by this interruption. However, if the speed of this axis is high, cavitation may occur a lot in the propeller, which may generate a lot of undesirable noise.

Westinghouse Electric Corporation has developed a propulsion system with an integral motor to overcome these shortcomings. The motor is disclosed in US Pat. No. 4, 831, 297. This special propeller is similar in structure to a jet engine and has a cylindrical shroud with a water inlet and a water outlet and a propeller rotatably mounted on an axis on which a plurality of support vanes are mounted concentrically within the shroud. And an electric motor for driving the propeller. The electric motor includes an annular rotor mounted around the outer circumference of the propeller blades and a stator integrally formed in the protective plate of the propulsion device. The improved design of this particular prior art propulsion device is such that the device is not significantly disturbed by the flow of water that allows the propeller to run through a hydrodynamically shaped shroud, thereby reducing noise levels and The thrust output of the propulsion system is also significantly increased. The quietness of the device is further improved by the noise shielding characteristics of the shroud.

Although the propulsion device with the integral motor described above has made significant advances in the art, the Applicant has realized that much of the design of this device can be improved. For example, water-lubricated thrust and radial bearings should be replaced regularly. To do this, the propulsion unit must be put into a dry dock. In addition, where bearing parts need to be inspected or replaced, the propulsion device must be almost completely dismantled due to the position of this bearing. Applicants have found that a support vane located upstream of the propeller can cause cavitation in the water surrounding the propeller during operation of the propeller, thereby resulting in undesirable noise as well as reducing the efficiency of the device. I realized that it could be. In addition, the present applicant needs to have a very close distance between the outer diameter of the rotor and the inner diameter of the stator so long as electromagnetic coupling between the rotor and the stator can be made efficiently in the induction motor structure used in the special prior art propulsion apparatus. Also found out that there is. However, when so close, not only drag is generated in the thin water film disposed between the stator and the rotor; The magnitude of the harmonic currents conducted through the rotor (which is always present to some extent because the magnetic field formed by the stator is asymmetrical) is increased, causing the rotor to vibrate, causing unwanted additional noise. In addition, when the distance between the inner diameter of the stator and the outer diameter of the rotor is close, when the propulsion device is subjected to a strong mechanical impact, or when debris of seawater collects between the stator or the rotor, an unwanted weak area is formed in the propulsion device. May be

Accordingly, there is a need for an improved integral motorized propulsion device for use in ships such as submarines that does not need to be put into a dry dock and has a bearing assembly that is relatively simple and easy to perform inspection or maintenance work. In addition, however, the propulsion device produces less noise than prior art devices, and the spacing between the stator and the rotor does not have to be so close to reduce the vulnerability of the device in areas susceptible to mechanical shock or seawater debris collection. It would be ideal to have a design.

The present invention relates to an integral motorized propulsion device in which the above mentioned disadvantages associated with the prior art have been eliminated or at least improved. The propulsion device of the present invention generally comprises: a protective plate having a water inlet and a water outlet; A propeller having a hub rotatably mounted to the shaft within the protective plate; An electric motor for driving the propeller, the rotor being mounted around an outer circumference of the propeller, and an stator circumscribed with the protection plate; And a bearing assembly disposed between the hub of the propeller and the shaft, the bearing assembly being cooled and lubricated by the surrounding water surrounding the apparatus. The bearing assembly may comprise an impeller mechanism necessary to circulate the lubricating and cooling water streams between the surfaces of the bearing. Moreover, the shaft may include one or more flow inlets downstream of the propellers to provide a constant stream of water for lubrication and the cabinet for the bearing assembly. This flow inlet may be covered with a filter. The location of this inlet located downstream helps to prevent debris entrained in the surrounding water from entering the bearing assembly.

The bearing assembly may comprise a thrust bearing disposed between the propeller hub and the upstream end of the shaft, and a radial bearing cartridge disposed around the inner circumference of the propeller hub to reduce friction between these two parts of the autonomous. . The apparatus may further comprise a cover detachably mounted to the thrust bearing to facilitate access to the thrust bearing and the radial bearing cartridge during maintenance. The removable cover may be connected to the propeller hub to be rotated along the propeller during operation of the apparatus, or may be detachably secured to the water inlet of the shaft as a separate part and remain stationary against the rotating propeller. The removable cover at rest has the advantage that the propulsion system further reduces noise during operation. In some cases, struts may be added between the fixed removable cover and the shroud to increase the impact resistance of the device.

The plurality of vane members are connected between the shaft of the device and the inner surface of the protective plate. In order to further reduce the amount of noise generated by the stream of water flowing through the shroud, the vane member is connected to both a portion of the shaft disposed between the hub of the propeller and the water outlet of the shroud. Moreover, since the vane member cooperates with the blade of the propeller to support the shaft concentrically in the protective plate, the thrust generated by the propulsion device is increased.

Finally, the rotor of the AC motor used to drive the propeller of the present apparatus may use a permanent magnet instead of an induction winding to form a necessary magnetic field in the rotor. Using such permanent magnets not only increases the overall efficiency of the motor (because the impedance loss through the induction winding is eliminated), but the gap between the outer diameter of the rotor and the inner diameter of the stator damages the good magnetic coupling between these two components. There is a further benefit of being able to increase without the need. Such increase in the size of the gap reduces the fluid drag on the rotor and reduces the strength of undesirable harmonic currents generated in the rotor due to the asymmetry of the magnetic fields from both the rotor and the stator, and consequently the rotor. The vibration of the motor is reduced, resulting in a smoother and quieter movement. In addition, this increase in the size of the gap further reduces the likelihood that the device will be damaged at this location due to the collection of seawater debris.

The rotor may further include a plurality of conductive damper bars on the outer circumference of the permanent magnet to provide a squirrel barrel structure that can help the rotor in synchronizing with the swinging magnetic field coming from the stator. This damper bar insulates the magnet from demagnetizing currents such as the above-mentioned harmonic currents, or currents generated in the short circuit of the device. A pole cap may be disposed on the surface of each permanent magnet to cover the conductive damper bar and space the magnet from it. The conductive wedges may be disposed between the permanent magnets in the rotor to increase the current conducting ability to tongue the squirrel barrel structure. Finally, it is desirable to incline the stator slots to further reduce noise.

Since the further device of the present invention has the above-described structure, it is lighter in weight, higher in output, and generates less noise than the prior art propulsion device.

The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

Referring to FIGS. 1, 2, 3, and 4, the same reference numerals refer to the same parts throughout the several views, wherein the propulsion device 1 of the present invention generally has a water inlet 5 and a water outlet 7. Cylindrical protective plate (protective plate assembly) 3 is included. The interior of the shroud generally has a detective similar to a Kort nozzle. A plurality of vane members 11 are attached to the fixed shaft (non-rotating shaft) 9 along the rotation axis inside the protective plate 3. The vane member 11 supports the stationary shaft 9 in the protective plate 3, as well as the thrust generated by the propeller means 13 due to their inclined orientation (best shown in FIG. 4). It also performs a function to increase. The propeller means 13 are arranged inside the protective plate 3. The propeller means 13 have a hub at its center which is rotatably mounted to the fixed shaft 9 by a bearing assembly 17. The propeller means 13 have a plurality of inclined blades 19. The inner end of the blade 19 is mounted at equal intervals around the hub 15, and the outer end is a rotor of an electric motor (alternating motor) 24 which is integrally formed at the central portion of the protective plate 3. Is connected to (23). The electric motor 24 further comprises a stator 25 which is arranged about the rotor 23 and spaced apart from it closely. A terminal post assembly 27 is provided on top of the propulsion apparatus 1 for connecting the stator 25 of the propulsion apparatus 1 to the power source 28. In a preferred embodiment this is a cyclo-converter of variable frequency.

2 and 5 (a), the bearing assembly 17 of the propulsion device 1 is designed to minimize the circumferential and axial friction between the propeller means 13 and the fixed shaft 9. To this end, it has a radial bearing (radial bearing cartridge) 30 and a thrust bearing (thrust bearing assembly) 45. Looking specifically at Figure 5 (a), the radial bearing 30 has a tubular bushing 32. The tubular bushing 32, preferably formed of Monel, is mounted to the inner diameter of the hub 15 by a pair of bolt lugs 34. Each of the bolt lugs 34 has a screw bore 35. This screw bore 35 is aligned with a bolt (mounting bolt) 37 present in the sharp upstream portion 36 of the hub 15. When this bolt 37 is fixed in the position shown in FIG. 2, the tubular bushing 32 is naturally rotated about the stationary shaft 9 along the hub 15. A pair of rubber bearing sleeves 38a and 38b are disposed in the inner diameter of the tubular bushing 32. This sleeve is disposed in an annular recess 40 which exists along the inner surface of the tubular bushing 32, preventing the axial movement between the bearing sleeves 38a, 38b and the tubular bushing 32. Each of the inner diameters of the rubber bearing sleeves 38a and 38b has a plurality of spiral grooves 42 for discharging external substances accompanying seawater that always flows between the bearing sleeves 38a and 38b and the fixed shaft 9. ) Is provided. The thrust bearing 45 has a main thrust bearing 47 designed to accommodate the axial load generated by the propeller means 13 during operation of the propulsion apparatus 1 and the electric motor 24 will not operate. It is provided with an auxiliary thrust bearing 75 which is designed to withstand the considerably light load of the propeller means 13 "windmilling".

The main thrust bearing 47 is provided with an annular runner 49 formed of an inclined annular pad 51 which supports a rubber annular ring 53. The inclined annular pad 51 is preferably formed of a monel. The inclined yellow pad 51 and the rubber annular ring 53 are provided with a screw bore 55 present in the annular pad 51 and a bolt mounted in the sharp upstream portion 36 of the hub 15 (mounting bolt). 57, it is fixed to the upstream portion 36 of the hub 15. The main thrust bearing 47 also has a bearing ring 60. Since the bearing ring 60 is mounted stationarily on the fixed shaft 9, the bearing ring 60 is frictionally coupled to the rubber annular ring 53 of the annular runner 49 during operation of the propulsion device 1. A plurality of radial grooves 61 are provided around the bearing ring 60 to form a seawater film for lubrication between the rubber annular ring 53 of the annular runner 49 and the bearing ring 60. This radial groove 61 is used for the purpose of always circulating seawater between the annular runner 49 and the bearing ring 60, thereby reducing wear by eliminating the heat generated by friction. The bearing ring 60 is connected to a plurality of link pin supports 62a and 62b, which are fixed to the support pad 64. Since the support pad 64 is firmly mounted to the fixed shaft 9 by the key 66, the support pad 64 is prevented from rotating about the fixed shaft 9. The bumper plate 67 is mounted on the opposite side of the bearing ring 60 of the support pad 64 by a retaining stud 69. The bumper plate 67 has a convex surface that engages with the concave surface of the support pad 64, which surface supports the bumper plate 67 in response to it when the two parts are slightly off-center with respect to each other. Slightly “wobbled” against pad 64. As shown in the figure, the bumper plate 67 forms part of the auxiliary thrust bearing 75 although it is mechanically integrated with the main thrust bearing 47 structure. The fixing nut 72 is engaged with the fixing nut washer 74 to serve to firmly fix the support pad 64 to the fixing shaft 9 in the axial direction.

The auxiliary thrust bearing 75 is generally located upstream of the main thrust bearing 47 and has a runner 77 formed from an annular ring 79 made of rubber. Similar to the bearing ring 60 described above, the rubber annular ring 79 has a groove for forming a thin seawater film between the rubber annular ring 79 and the annular support pad 81 facing it. 80 is provided. The annular support pad 81 is preferably formed from the monel similar to the above. In order to facilitate circulation of the seawater through the bearing assembly 17, the annular support pad 81 further includes a plurality of radial water circulation means (impeller bores) 83. The inner end of the water circulation means 83 is in communication with a central opening 84 disposed in the center of the annular support pad 81. The annular support pad 81 functions as an impeller for forcibly circulating seawater through various bearing surfaces in the bearing assembly 17 during operation of the propulsion device 1.

At the upstream end of the fixed shaft 9 is provided a removable cover 85 of a curved tongue, which prevents unfiltered seawater from flowing through the bearing assembly 17. In the embodiment of the present invention, the removable cover is attached to the annular support pad 81 of the runner 77 of the auxiliary thrust bearing 75, so that the fixed shaft 9 is operated when the electric motor 24 is operated. Is rotated against. The removable cover 85 has a plurality of recessed bores 87 for receiving the mounting bolts 89 in order to achieve this purpose, the mounting bolts being upstream of the annular support pad 81. Screwed into the screw bore present on the side. A plurality of leak bores 91 are present in front of the removable cover 85 to allow seawater to sufficiently flow through the removable cover 85, thus allowing seawater flow between bearing surfaces present in the bearing assembly 17. Prevent pressure differentials that might interfere with Each of the leak bores 91 is preferably provided with a filter 92 for preventing the external material accompanying the sea water from entering the removable cover (85).

Due to the fact that the entire bearing assembly 17 is secured in place by the removable cover 85, the retaining nut 72 and the retaining nut washer 74, the key 66 and the bolts 57, 37, the primary and secondary Thrust ?? Easy omnidirectional access to both the bearings 47 and 75 and the radial bearing 30 is possible. Since this omnidirectional access is easy, management work such as repair and replacement of parts can be performed without removing the entire propulsion device 1 from the ship or putting the ship in a dry dock. This is an important advantage as the various parts of the bearing assembly 17 are one of the most needed repair and replacement of the propulsion device 1 regardless of how well designed it is.

A downstream end of the fixed shaft 9 is provided with a vane hub 95 which is connected to the inner end of each of the vane members 11 described above. The fixing shaft 9 fixes the vane hub 95 to the downstream end by the mounting bolt 97. The vane hub 95 has a plurality of vanes covered with filtration means (filtrate) 102 to prevent foreign matter entrained in the surrounding water from entering the hollow interior 104 of the vane hub 95. Water circulation means (flow port or water inlet) 99. As is evident in both FIGS. 2 and 5 (a), the hollow interior 104 of the vane hub 95 communicates with the central bore 106 present on the fixed shaft 9.

The manner in which seawater circulates through the bearing assembly 17 will be best understood with reference to FIG. 2. As indicated by the flow arrows, the surrounding seawater passes through the downstream water circulation means 99 and the filtration means 102 and then the hollow interior 104 and the fixed shaft 9 of the vane hub 95. Flow through the central bore 106. Water passing through the central bore 106 flows through the central opening 84 of the annular support pad 81 and the plurality of water circulation means 83. Due to the centrifugal force imparted to the seawater flowing through the water circulation means 83, the water is compressed and exits the outer end of the water circulation means 83, and then the support pad 64 of the main thrust bearing 47. ) Flows in the reverse direction along the outer periphery, and from there through the central opening present in the annular runner 49 of the main thrust bearing 47 between the grooves of the bearing ring 60. The seawater from there flows between the rubber bearing sleeves 38a and 38b and the outer surface of the fixed shaft 9 and is discharged through the radial opening 107. Although some seawater flow may occur through the leak bore 91 present in the removable cover 85 described above, the leak bore 91 is more suitable than the water circulation means 99 present in the vane hub 95. It is designed to have a much smaller cross-sectional area. Since the dimensions are designed to have such a cross-sectional area, most of the water used to lubricate and cool the various bearing surfaces of the bearing assembly 17 can be sucked into the propulsion device 1 from the downstream end, and the water circulation means Due to the presence of the filtering means 102 in 99, foreign matter entrained in the seawater is prevented from entering the central bore 106 of the fixed shaft 9.

6 and 7 show details of the electric motor 24 used to actuate the propeller means 13 of the propulsion device 1. As initially pointed out, the electric motor 24 is an alternating current motor, which is generally composed of a rotor 23 mounted to surround the periphery of the blade 19 of the propeller means 13, with a protective plate around the rotor ( 3) The stator 25 which is "canned" is closely arranged. In a preferred embodiment, the electric motor 24 is preferably a permanent magnet. Induction AC motors may also be used, but permanent magnet AC motors are preferred for the following two reasons. First, the permanent magnet motor is about 10% more efficient than the induction motor. Secondly, this high efficiency can be realized because of the rather large gap between the outer circumference of the rotor 23 and the inner circumference of the stator 25. In the operable propulsion apparatus 1, this large clearance may be as wide as 1.31 cm or 0.50 inches, unlike the standard clearance of 0.635 cm (0.25 inch) or less. The use of large clearances (rather than using smaller clearances) reduces the frictional loss between these two elements caused by the presence of turbulent seawater between the rotor 23 and the stator 25, and this special feature of the propulsion system. The amount of noise generated at the location is further reduced. Another advantage is that a small amount of harmonic currents (generated by the undesired asymmetry of the magnetic field generated in the stator windings) is generated and, as a result, lower vibrations due to the interaction of such currents on the rotor 23. Opposite to higher vibrations). In addition, when the rotor 23 rotates in the stator 25, the vibration generated by the rotor 23 out of the center is also reduced. Finally, with this large gap provided by the use of permanent magnets in the electric motor 24, the rotation of the rotor 23 in the stator 25 is interrupted or interrupted by the introduction of foreign matter into the gap. Less phenomena will occur, and also greater resistance of the propulsion device 1 to external shocks will be greater. The propulsion device 1 will then be more resistant to damage due to impact, which causes the rotor 23 to be impacted out of its center relative to the stator 25. All of these are important advantages, especially in the application of submarines.

As best shown in FIG. 7, the stator 25 has a plurality of evenly spaced stator core windings 110. Each of these stator core windings 110 is in turn connected to the lead wire 111 of the terminal post assembly 27. Furthermore, each stator core winding 110 may have a stator core 112 formed from a steel ring made of a laminated magnetic material (FIG. 6 or in order to conduct the magnetic field generated by the stator core winding 110). It is housed in a slot that is not shown in FIG. 7 but exists in FIGS. 2 and 5 (a). A plurality of building bars 114 are welded along the outer diameter of the stator core 112 to hold together the stacking rings that form the stator core 112. All elements of the stator 25 are housed inside the watertight stator housing 116 formed from the outer wall 120 and the inner wall 118.

The rotor 23 of the electric motor 24 is formed of a plurality of trapezoidal permanent magnets 125 mounted inside the magnet housing ring 127 formed from carbon steel. Each permanent magnet 125 is preferably formed from an NbBFe alloy because its magnetic field capacity and the B-H characteristic curve of this material are excellent. Each permanent magnet 125 is held in a magnet housing ring 127 by a zirconium copper wedge 128. The wedge 128 is secured to the magnet housing ring 127 by bolts 129. In a preferred embodiment, about 20 such trapezoidal permanent magnets 125 are arranged in the rotor 23. Four damper bars 130 formed of solid copper rods are provided on top of each permanent magnet 125. This damper bar 130 is disposed in a recess present in pole cap means 133 secured to the top of each permanent magnet 125. The purpose of the installation of the damper bar 130 and the wedge 128 is to induce a current waveguided to the upper surface of the rotor 23 resulting from the generation of undesirable magnetic asymmetry by the stator core winding 110. It is to protect the permanent magnet 125 from. In particular, such harmonic currents will be concentrated in the highly conductive damper bar 130 and the wedge 128, where they will be consumed. If the damper bar 130 and the wedge 128 are not present in the rotor 23, such a wave induced current will pass directly through the body of the permanent magnet 125, and eventually its magnetism will be reduced. Moreover, since the combination of the damper bar 130 and the wedge 128 forms the structure of the squirrel barrel, the start of the operation of the rotor 23 is promoted.

Referring to FIGS. 5 (a), 5 (b) and 7, the rotor 23 is “cant-sealed” in the watertight rotor housing 134 similarly to the stator 25. have. The rotor housing 134 has an inner wall 136, an outer wall 138, a front wall 140 and a rear wall 142 (all shown in FIG. 5 (a)). In particular referring to FIG. 5 (b), the rotor inlet ring 144 is connected to the back wall 142 of the rotor housing 134 and includes a toothed back wall 146. The toothed back wall 146 has a shape complementary to the toothed front wall 148 of the stator inlet ring 150 disposed opposite the rotor inlet ring 144. Complementary tooth structures of the toothed back wall 146 and the toothed front wall 148 of the rotor and stator inlet rings 144, 150 form a warped passageway to the seawater in the vicinity thereof, thereby entraining them in the seawater. Outer particles are prevented from entering the gap between the outer circumference of the rotor 23 and the inner circumference of the stator 25. Furthermore, a plurality of spiral grooves 151 are formed on the outer circumference of the rotor 23 to circulate and discharge the foreign material from the gap between the rotor 23 and the stator 25. The flow path formed by the helical groove 151 is shown by the flow arrow at the top of FIG.

Referring again to FIGS. 2 and 5 (a) for details of the protection plate 3, the protection plate 3 has a funnel shaped inlet streamline 154. The inlet streamline 154 is secured to the upstream side of the stator housing 116 by mounting bolts 156. The vane mounting ring 158 is secured to the downstream side of the stator housing 116 by mounting bolts 160. The outlet ring 162 is secured to the downstream side of the vane mounting ring 158 by bolts 164. The funnel-shaped inlet streamline 154 and the truncated cone-shaped vane mounting ring 158 are formed in combination with the stator housing 116, and the coat nozzle contour that advantageously maximizes the thrust of the propeller means 13 is provided with a protective plate 3. You will see that it is mounted inside).

8 and 9 show another embodiment of the propulsion device 1 of the present invention. Unlike the above-described embodiment, the removable cover 167 according to this embodiment is held in a stationary relationship with the hub 15 of the propeller means 13, so that the rotary cover generates water in the surrounding water. Disturbance is minimized. This is because, if the rotary cover is provided, not only the efficiency of the propulsion apparatus 1 may be lowered, but also undesirable noise may be generated. The removable cover 167 of this another embodiment has a tightening means (threaded recess) 169 in the center of its interior. This recess may be screwed into a fastening means (threaded stud) 171 which is fixedly mounted upstream of the fixed shaft 9. Moreover, this alternative embodiment may have a plurality of struts (reinforcement struts) 173 connected between the stationary removable cover 167 and the interior of the protective plate 3. This strut 173 increases the impact resistance of the present propulsion device 1 and thus may be an important consideration in the technical field of the submarine. In this embodiment, in the case of all parts except the fastening means 171 and the strut 173 of the stationary detachable cover 167 and the fixed shaft 9, the same thing as the first embodiment of the present invention described above is used. .

Claims (26)

1. A submersible propulsor unit comprising: a guard plate (3) having a water inlet (5) and a water outlet (7); A propeller means 13 having a hub 15 rotatably mounted to a fixed shaft 9 in the protection plate and for driving the propeller means 13, around the outer circumference of the propeller means 13. An electric motor 24 having a rotor 23 to be mounted, a stator 25 mounted in the protection plate 3 and spaced apart from the rotor 23 but magnetically coupled thereto, and the propeller Water circulation means having a bearing surface disposed between the hub 15 of the means 13 and the fixed shaft 9 and lubricating and cooling the bearing assembly 17 by circulating water around the bearing surface. An underwater propulsion device comprising a bearing assembly (17) having (83, 99). The bearing assembly (17) has an impeller for circulating water around the bearing surface. The vane member (11) according to claim 1, wherein the vane member (11) is connected between the protective plate (3) and the fixed shaft (9) to support the fixed shaft (9) along the axis of rotation of the protective plate (3). Further comprising; The vane member 11 is connected to a part of the fixed shaft 9 arranged between the hub 15 and the water outlet of the protective plate 3, so as to reduce noise generated by the propeller means 13. Underwater propulsion system. 4. The bearing assembly (17) according to claim 3, wherein the bearing assembly (17) comprises a thrust bearing (45) and a radial bearing (30) disposed between the fixed shaft (9) and the hub (15) of the propeller means (13). Underwater propulsion system. 4. The water circulation means according to claim 3, wherein the water circulation means has a water intake port in the fixed shaft 9 that is substantially aligned with the water outlet 7 of the protection plate 3, thereby preventing debris particles from entering the water intake port. Underwater propulsion system. 2. The rotor (20) according to claim 1, wherein the rotor (23) is provided with permanent magnets to increase the minimum distance between the rotor (23) and the stator (25) necessary for efficient magnetic coupling, thereby reducing drag and propeller. An underwater propulsion device in which all of the noise generated by the means is reduced. The fixed shaft (9) has an end facing the water inlet (5) of the protective plate (3), and the hub (15) of the propeller means (13) is connected to the thrust bearing (45). Connected to transmit almost all thrust generated by the propeller means to the shaft end. 7. The underwater propulsion apparatus of claim 6, wherein the rotor (23) has a damper bar (130) to protect the magnet from harmonic currents. 10. The underwater propulsion of claim 8, further comprising a removable cover 85 for covering the thrust bearing 45 during operation of the underwater propulsion device and for providing easy access to the thrust bearing 45 during maintenance operations. Device. An underwater propulsion device comprising: a protective plate (3) having a water inlet (5) and a water outlet (7); The propeller means (13) having a hub (15) rotatably mounted to the fixed shaft (9) in the protective plate (3) and for driving the propeller means (13), An electric motor 24 having a rotor 23 mounted around an outer circumference, a stator 25 mounted in the protection plate 3 and magnetically coupled to the rotor 23, and the fixed shaft 9 ) Is connected between the protection plate (3) and the fixed shaft (9) to support along the axis of rotation of the protection plate (3), the water outlet (7) of the hub (15) and the protection plate (3) Underwater propulsion device comprising a plurality of vane members (11) connected to a portion of the fixed shaft (9) disposed between them to reduce the noise generated by the propeller means (13). An underwater propulsion device comprising: a protective plate (3) having a water inlet (5) and a water outlet (7); A hub (15) rotatably mounted to the stationary shaft (9) in the guard plate (3), the stationary shaft (9) having an end facing the water inlet (5) of the guard plate (3) A bearing assembly (17) having a propeller means (13), a thrust bearing (45) disposed between the hub (15) of the propeller means (13) and the water inlet of the fixed shaft (9), and the propeller means (13) for driving the rotor 23, which is mounted around the outer periphery of the propeller means 13, mounted in the protective plate 3 and spaced apart from the rotor 23 but magnetically An electric motor 24 having a stator 25 engaged with it, and the fixed shaft 9 on the thrust bearing 45 are mounted at a water inlet, and when the propeller means 13 rotates the hub ( 15) in a stationary relationship to reduce noise generated by the rotation of the hub (15). Underwater propulsion apparatus including a removable cover lock (167). 12. An underwater propulsion device according to claim 11, wherein said removable cover (167) is detachably mounted to said stationary shaft (9) to provide easy access to said thrust bearing (45). An underwater propulsion device according to claim 11, wherein said underwater propulsion device further comprises a plurality of struts (173) between said removable cover (167) and said protective plate (3) for increasing the inner layer toughness. 12. The fastening cover 167 according to claim 11, wherein the removable cover 167 is fixed by a single fastening means 169, 171 disposed at the center of the upstream end of the removable cover 167 so as not to leave surface irregularities in its contour. Underwater propulsion unit mounted to the water inlet of the shaft (9). 12. The plurality of vane members (11) according to claim 11, which are connected between the protective plate (3) and the fixed shaft (9) in order to support the fixed shaft (9) along the axis of rotation of the protective plate (3). Further comprising; The vane member 11 is connected to a part of the fixed shaft 9 disposed between the hub 15 and the water outlet 7 of the protective plate 3, and is generated by the propeller means 13. An underwater propulsion device configured to reduce noise and increase thrust of the underwater propulsion device. 12. An underwater propulsion device according to claim 11, wherein the bearing assembly (17) is provided with water circulation means (83, 99) for circulating water around a surface, thereby lubricating and cooling the bearing assembly (17). 12. An underwater propulsion device according to claim 11, wherein the bearing assembly (17) further comprises a radial bearing (30) disposed between the fixed shaft (9) and the hub (15) of the propeller means (13). The water circulation means according to claim 16, wherein the water circulation means has a water intake port in the fixed shaft 9 that is substantially aligned with the water outlet 7 of the protection plate 3, thereby preventing debris particles from entering the water intake port. Underwater propulsion system. 19. The underwater propulsion apparatus of claim 18, further comprising filtration means (102) disposed between the water intake port and the water around it to prevent debris particles present in the periphery from entering the water intake port. 18. The underwater propulsion according to claim 17, wherein the radial bearing (30) has at least one spiral groove (42) for ejecting debris particles disposed between the relatively movable surfaces of the radial bearing (30). Device. In an underwater propulsion apparatus, a propeller having a guard plate (3) having a water inlet (5) and a water outlet (7) and a hub (15) rotatably mounted to a fixed shaft (9) in the guard plate (3). Means 13, the rotor 23 for driving the propeller means, the rotor 23 is mounted around the outer periphery of the propeller means 13, the rotor 23 and the outer circumference of the inside of the protection plate (3) An electric motor 24 having a stator 25 spaced apart but magnetically coupled thereto; The rotor 23 is provided with a permanent magnet 125 to increase the efficiency of the electric motor 24 and to increase the spacing between the rotor 23 and the stator 25, the rotor 23 Underwater propulsion device to reduce the noise generated by the) and the frictional drag applied to the rotor (23). 22. The squirrel according to claim 21, wherein the rotor (23) assists the rotor in synchronizing with the oscillating magnetic field coming out of the rotor (23) and further insulates the permanent magnet (125) from potato currents. In order to provide a cylindrical structure, the underwater propulsion device further comprises a plurality of conductive damper bar (130) on the outer periphery of the permanent magnet (125). 23. The pole cap means (133) of claim 22, wherein the rotor (23) is disposed on each of the permanent magnets (125) to cover the conductive damper bar (130) and to separate it from the permanent magnets (125). Underwater propulsion system further comprising). 23. The underwater propulsion apparatus of claim 22, wherein the rotor (23) further comprises conductive wedges (128) disposed between the permanent magnets (125) to increase the current conducting capacity of the squirrel barrel structure. 22. The underwater propulsion apparatus according to claim 21, wherein at least one groove (151) is provided in the surface to eject incoming debris between the spaced apart surfaces of the stator (25) and the rotor (23). The underwater propulsion device according to claim 25, wherein the groove (151) is provided on the outer circumferential surface of the rotor (23).